Report of investigations / State of Illinois, Department of Registration and Education, Division of the State Geological Survey.

c.1 no.1-20 inc.; no.2 1925; no.1-9 (1924-26); no.4-9 1925-26; no.11 (1926); no.12-15 (1927-28); no.13-30; no.16 (1928); v.1-19 1924-1929 incompl.; no.12-17 1927-29; no.17-23 (1929-31); no.19-25 1929-32; no.28-29 1933; v.20-32 1930-1934; no.24-36 (1932-34); no.31-33 1933-35; no.35-37 1934-35; no.31-41 1933-1936; v.33-43 1935-1936; no.37-48 (1935-37); no.39-42 1936-37; no.44-51 1937-38; v.44-60 1937-1939; no.49-60 (1938-39); no.54-55 1939; no.42-61 1936-1940; no.59-65 1939-40; no.61-70 (1940); no.67 1940; no.62-81 1940-1942; no.70-79 1940-42; no.71-79 (1940-42); v.61-85 1940-1942; no.80-88 (1942-43); no.81-89 1942-43; no.89-92 (1943); no.82-100 1942-1944; no.90-94 1943-44; no.93-99 (1944); no.96-97 1944; no.98-105 1944-45; no.100-108 (1944-45); no.107-116 1945-46; no.109-116 (1945-46); v.102-121 1945-1946; no.101-122 1944-1947; no.117-122 (1946-47); no.117-124 1946-47; no.123-127 (1947); no.125-130 1947-48; v.122-131 1947-1948; no.128-135 (1948); no.132-142 1948-49; no.136-144 (1949); no.132-147 1949-1950; no.143-148 1949-51; no.145-150 (1949-51); no.148-158; no.149-159 1950-52; no.151-158 (1951-52); no.159-167 (1952-53); no.160-173 1951-1954; no.160-176 1951-54; no.162; no.163; no.165; no.166; no.167; no.168; no.168-180 (1953-55); no.169; no.171-185 1954-55; no.174-185 1954-1955; no.177-185 1955; no.181-188 (1955); no.186-193 1955-56; no.186-199 1955-1957; no.187; no.188; no.190-199 1955-57; 194-199 (1956-57); no.194-200 1956-57; 200-206 (1957-58); no.201-207 1957-58; no.200-212 1957-1959; no.200-210 1957-59; no.208-212 1958-59; no.211-216 1959-63; no.213-218 1960-64; 214-219 (1960-66); no.213-220 1960-1966; no.217-221 1963-68; 220-221 (1966-68); no.219-221 1966-68; no.221; no.221 1968